+ Site Statistics
References:
54,258,434
Abstracts:
29,560,870
PMIDs:
28,072,757
+ Search Articles
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ PDF Full Text
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Translate
+ Recently Requested

Soap bubbles in analytical chemistry. Conductometric determination of sub-parts per million levels of sulfur dioxide with a soap bubble



Soap bubbles in analytical chemistry. Conductometric determination of sub-parts per million levels of sulfur dioxide with a soap bubble



Analytical Chemistry 78(8): 2786-2793



Soap bubbles provide a fascinating tool that is little used analytically. With a very low liquid volume to surface area ratio, a soap bubble can potentially provide a very useful interface for preconcentration where mass transfer to an interfacial surface is important. Here we use an automated system to create bubbles of uniform size and film thickness. We utilize purified Triton-X 100, a nonionic surfactant, to make soap bubbles. We use such bubbles as a gas-sampling interface. Incorporating hydrogen peroxide into the bubble provides a system where electrical conductance increases as the bubble is exposed to low concentrations of sulfur dioxide gas. We theoretically derive the conductance of a hollow conducting spherical thin film with spherical cap electrodes. We measure the film thickness by incorporating a dye in the bubble making solution and laser transmission photometry and find that it agrees well with the geometrically computed thickness. With the conductance of the bubble-making soap solution being measured by conventional methods, we show that the measured values of the bubble conductance with known bubble and electrode dimensions closely correspond to the theoretically computed value. Finally, we demonstrate that sub-ppm levels of SO(2) can readily be detected by the conductivity change of a hydrogen peroxide-doped soap bubble, measured in situ, when the gas flows around the bubble.

(PDF emailed within 0-6 h: $19.90)

Accession: 050329779

Download citation: RISBibTeXText

PMID: 16615794

DOI: 10.1021/ac052198h


Related references

Generating Soap Bubbles by Blowing on Soap Films. Physical Review Letters 116(7): 077801, 2016

Bubbles to Wubbles: an investigation involving the contamination of soap bubble products at a pediatric hospital. Journal for Specialists in Pediatric Nursing 11(3): 189-195, 2006

Conductometric sensor for parts per billion sulfur dioxide determination. Analytical Chemistry 58(8): 1771-1777, 1986

Microscopic identification of two liquid crystalline soap phases, neat soap and middle soap. American Mineralogist 32(11-12): 693-694, 1947

Effect of the precipitation of neutral-soap, acid-soap, and alkanoic acid crystallites on the bulk pH and surface tension of soap solutions. Langmuir 23(7): 3538-3553, 2007

Enhanced processing of synthetic bar compositions comprising amphoterics based on minimal levels of fatty acid soap and minimum ratios of saturated to unsaturated soap. Official Gazette of the United States Patent & Trademark Office Patents 1238(3), Sep 19, 2000

Soap, soap sensitivity and soap substitutes. Ann Allergy 3: 1, 50-61, 1945

Cleansing of sensitive skin; with determination of the pH of the skin following use of soap and a soap substitute. Journal of Investigative Dermatology 9(1): 5-9, 2016

Soap bubbles. Journal of Analytical Chemistry 62(1): 1-1, 2007

Foam soap is not as effective as liquid soap in eliminating hand microbial flora. American Journal of Infection Control 45(7): 813-814, 2017

The effectiveness of soap and of soap substitutes against grey mould (Botrytis cinerea) of grapes. Phytppath. Z, 17: 265-86. bibl. 12, 1950

Surface active properties of combinations of soap and lime soap dispersing agents. Journal of the American Oil Chemists' Society: 54 (9) 339-342, 1977

Serial Measurements of Soap Weights and Soap Availability to Describe Handwashing Behavior. American Journal of Tropical Medicine and Hygiene 99(4): 899-904, 2018

Ordinary soap is as effective as antibacterial soap for handwashing, study finds. Bmj 351: H4944, 2016

Microbicidal effects of plain soap vs triclocarban-based antibacterial soap. Journal of Hospital Infection 94(3): 276-280, 2016